Soot blower for steam boilers



Nov. 2 1926. 1,605,233

0. c. HookER 500T BLOWER FOR STEAM BOILERS Original Filed 00% 1 1 21 2 Sheets-Sheet 1 Q Q Q Q Q 5 Q Invnan Nov. 2 1926. 1,605,233

D. C. HOOKER SOOT BLOWER FOR STEAM BOILERS Original F l in 1 1 21 2 Sheets-Sheet 2 Invenfar 419mm /9040 7 Zorn/e19 Patented Nov. 2, 1926.

UNITED STATES DUNCAN C. HOOKER, OF FARMINGTQN, CONNECTICUT.

SOOT BLOWER FOR STEAM BOILERS;

Application filed October 10, 1921, Serial No. 506,740. Renewed April- 11, 1925.

Thisinvention relates to that form of sootblowers for wat-ertube steam boilerswhereby soot, aslr. and kindred products of. fuel combustion are removed from. the exterior surfaces of the boiler tubes by the agency of jets of steam. directed'thereon from nozzles incorporated in the blower tube or" element that extends across the boiler tubes in a po-v sition adjacent thereto. Such blower tubes are commonly mounted in bearings attached to. some of the boiler tubes so asto be axially rotatable for the purpose of varying the direction of the. steam jets, and one end ex tends through theboiler setting and on the outside is provided withv a swivelled header comprising suitable means of rotation and valves to control the admission and flow of steam to the blower pipe.

The blower tubes or elements, owing to their location within the boiler setting in the path of the gases of combustion, are subject.- ed to the same intense heat as the boiler tubes themselves. But, unlike the boiler tubes, which are continually cooled by the presence and flow of water and the generation of steam. within, the temperature of the sootblower tubes is relieved by no such cooling agency except at infrequent intervals for pe riods of short duration when steam isturned through them to clean the boiler tubes. The continual subjection of the blower tubes to such intense heat renders them liable to rap id deterioration in the form of oxidation, warpage and distortion, so that they require replacement at frequent intervals, with con sequent expense for material, labor and interruption of service. Attempts have been made to draw away the heat fromthe blower tubes to the boiler tubes through the bearings; but this has failed in practice owing to the; impossibility of: maintaining alignment between bearings fitted with the necessary' closeness and having sufliciently extended bearing surfaces to-function as thermal conductors. In fact,owing to the war age of blower elements and the constant expansivemovement of the boiler tubes, it has been found necessary to sofar reduce theextent and increase the radial clearance of these so-called conducting bearings, that they function no more than mere supporting brackets.

The object of the present invention is to overcome the above mentioned defects, by the interposition of a stationary metallic barrier or casing between the blower tube and and the direct rays of heat from the fire, said: metallic structure having extended thermal conducting surfaces contacting with and positively secured to the boiler tubes, headers, water-legs or other metal parts of the steam generating system of the boiler. Suchz metallic barrier does not come in contact at any point with: the blower tube, but

intercepts: the heat rays which would otherwise reach and ultimately impair the blower tube and transfers such heat, by virtue of its high: thermal;conductivity, extended contact surfaces, and positive connection to the boiler tubes'or'oth'erparts designated above, where it. is absorbed and usefully expended inthe: generation of steam.

p In the accompanying drawings Figure 1 shows a section of a water tube boiler in which is installed a soot-blower arranged and protected. according to this invention, the thermal conducting barrier being divided into sections secured severally to alternate water tubes, the intervening water tubes carrying: the blower tube supports. Fig. 2 shows a plan. on larger scale of a section of the'form of the barrier illustrated in Fig. 1. Fig. 8 shows aside view of the barrier. Fig. 4 shows an endelevation of the barrier. Fig. 5 shows a sectional end elevation ofanother form in which the thermal: conducting barrier is attached to the front water leg of the boiler;

In the illustrations the water tubes 1, steam drums 2, boiler setting 3 arev of a common form and arrangement The sootblower tube 4 with its nozzles 5 extends transversely of the water tubes and is supported'by bearing plates 6 which are clamped to alternate water tubes by shackle bolts 7 On the end of the soot-blower tube outside of thesetting is a steam admission head 8 of conventional design provided with means whereby the blower tube may be rotated.

The-heat conducting barriers are shown as sectional U-shaped metallic castings 9 provided with integral bracket plates 10 having a considerable mass of metal. The bracket plates are designed to fit closely to and be clamped securely against alternatewater tubes by means of sliaclrle'boltsll. The U-shaped castings are assembled end to end so as to forma continuoustrough through'which the blowertube passesbut the blower tube and its supports :nowhere are in engagement with or come into contact with the castings or their supports. In the edges of the castings are notches 12 which permit the passage of steam ets from the blower nozzles when the blower is in use and the tube is being turned for directing the jets in various directions.

In Fig. 5 the blower tube 13 is shown as located near the ends of the water tubes 1% adjacent to the front water leg 15 of the boiler. The thermal conducting barrier 16 in this case may be of wrought metal and it may be attached to the wall of the front water leg in which the water tubes terminate, in any suitable manner.

A metallic barrier of the form herein described possesses great advantages over all forms of brick, tile or other refractory barriers hitherto introduced into boilers for similar purposes, in that instead of reflecting back or diverting the heat which it intercepts, such intercepted heat is directly conducted to the steam generating surfaces.

Another useful feature of the invention is that should the space between the metal barrier and the blower tube become filled with soot and ash, which are recognized as heat insulators of the highest value, additional protection is afforded to the blower element. And further such insulating materials would obstruct the flow of currents of hot gases in the barrier about the blower tubes.

The invention claimed is 1. The combination with the water tubes of a steam boiler, of a soot blower tube supported by certain of said water tubes, and a heat conducting casing extending parallel with the blower tube and arranged about and interposed between the blower tube and the direct rays of heat from the fire and supported by others of said water tubes, said casing and its supports being independent of and having no connection with said blower tube and its supports, whereby heat units from the fire are diverted from the blower tube and conducted to said other water tubes by the casing.

2. The combination with the water tubes of a steam boiler, of a soot blower tube supported by certain of said water tubes, and a heat conducting casing extending parallel with the blower tube and interposed between said blower tube and the direct rays of heat from the fire, supported by others of said water tubes, with said casing and its supports separated from the blower tube and its supports throughout its entire extent by an air space, whereby the blower tube is insulated by said air space and heat units from the said other fire are conducted to the water tubes by the casing.

3. The combination with the water tubes of a steam boiler, of a soot blower tube supported by certain of said water tubes, and a heat conducting casing formed in sections arranged end to end about and interposed between said blower tube and the direct rays of heat from the fire and supported by others of said water tubes, said casing and its supports being independent of and having no connection with said blower tube and its supports, whereby heat units from the fire are diverted from the blower tube and conducted to said other water tubes by the casing.

1. The combination with the water tubes of a steam boiler, of a soot blower tube sup- "5 ported by certain of said water tubes, and a heat conducting casing formed of U-shaped castings arranged about and interposed between said blower tube and the direct rays of heat from the fire and supported by others of said water tubes, said castings and their supports being independent of and having no connection with said blower tube and its supports, whereby heat units from the fire are diverted by said castings from the blower tube and conducted to said other water tubes.

5. The combination with the water tubes of a boiler, of a soot blower tube extending transversely of the water tubes, and a metallic barrier arranged about and interposed between said blower tube and the direct rays of heat from the fire and supported by certain of said water tubes, said barrier and its supports being independent of and having no connection with said blower tube, whereby heat units from the fire are diverted from the blower tube and conducted to the last said Water tubes by the barrier.

6. The combination with the water tubes of a boiler, of a soot blower tube extending transversely of the water tubes, and a trough-shaped metallic barrier interposed between said blower tube and the direct rays of heat from the fire, supported by certain of said water tubes, with said barrier separated from the blower tube by an air space, whereby the blower tube is insulated by said air space, and heat units from the fire are conducted by the barrier to the last said water tubes.

7. The combination with the water tubes of a boiler, of a soot blower tube, and a metallic barrier supported by certain of said water tubes and protecting said blower tube from the direct rays of heat from the fire, said barrier and its supports being independ ent of and having no contact or connection with said blower tube, whereby heat units from the fire are diverted from the blower tube and conducted by the barrier to last said water tubes.

8. In a steam boiler the combination with a soot blower tube, of a metallic barrier supported by a steaming surface of the boiler and having no contact with said soot blower tube or its immediate supports, said barrier extending parallel with and positioned and formed to shieldsaid soot blower tube from the heat of the boiler fire by intercepting and diverting the heat away from the blower tube and conducting it to the steaming surbut spaced from said soot blower element face of the boiler to and by which said barand its supports, said barrier being posi- 0 rier is thermally connected and supported. tioned and formed to intercept heat units 9. In a steam boiler the combination with directed toward said soot blower element and water tubes and a soot blower element, of conduct the heat units to said supporting a metallic barrier extending parallel with water tubes. 7 and adjacent to the blower element in thermal contact with some of said water tubes DUNCAN C. HOOKER. 

